A dermatologist says he can reverse wrinkles. Others are unconvinced

Can wrinkles be "cured"? Yes, says Dr. Nicholas Perricone, an assistant clinical professor of dermatology at Yale medical school. He has made his case in two best-selling books, The Wrinkle Cure: Unlock the Power of Cosmeceuticals for Supple, Youthful Skin and The Perricone Prescription: A Physician's 28-Day Program for Total Body and Face Rejuvenation. His critics question his science and the efficacy of his products, which gross $100 million a year. He defends both.

IN THE WRINKLE CURE, YOU SAY, "WRINKLED SAGGING SKIN IS NOT THE INEVITABLE RESULT OF GROWING OLDER. IT'S A DISEASE, AND YOU CAN FIGHT IT." DO YOU...